The ABB FEN-21 68679303 serves as the primary FEN-21 Resolver Interface Module utilized to execute resolver signal acquisition and position feedback processing across ABB ACS850 platforms.

Hardware Identification & Part Numbers

The FEN-21 interface option installs into designated drive expansion slots to evaluate absolute shaft feedback. Hardware identification is detailed below:

• Module Designation: FEN-21
• Order Code: 68679303
• Hardware Variant: Option Slot Interface Card

Module Specifications

Deterministic Feedback & Backplane Bus Processing

The FEN-21 card converts analog resolver sinusoidal signals into digital position values for direct drive loop execution. Internal processing maintains deterministic network execution across Profinet and EtherNet/IP drive structures. Firmware flash compatibility ensures seamless backplane communication, precise speed loop updates, and exact motor position calculation without processing lag.

Package Checklist

• 1 x ABB FEN-21 68679303 Resolver Interface Module
• 1 x Grounding Clip Set
• 1 x Terminal Plug Connector Pack

Mounting & Wiring Procedures

• Power Down Sequence
  • Turn off main drive AC power and disconnect external 24 VDC auxiliary supplies before handling the module.
• ESD Control
  • Wear an anti-static wrist strap connected to cabinet earth during slot installation to prevent electrostatic damage.
• Mechanical Fastening
  • Slide card into the designated option slot until backplane connectors seat fully, then tighten retaining screws.
• Signal Shielding Guidelines
  • Connect resolver cable shields directly to the drive grounding plate using 360-degree grounding clamps.

Technical Questions & Answers

• Q: What auxiliary input voltage range is required for operating the FEN-21 module?

  A: The card operates on a nominal 24 VDC auxiliary power line with an allowable input voltage tolerance of +/- 10%.

• Q: What excitation parameters does the module output to the field resolver?

  A: The unit supplies excitation voltages between 4 V RMS and 8 V RMS operating at frequencies from 2 kHz to 15 kHz.

• Q: Can this option card be inserted while the drive remains fully powered?

  A: No, hot-swapping is prohibited; control voltage must be isolated to avoid damage to backplane logic circuits.

• Q: What accuracy and digital resolution are achieved by the position decoding circuit?

  A: The module provides accurate angular decoding within +/- 0.05 degrees, with software resolution ranging from 12-bit to 16-bit.

• Q: How is electrical noise suppressed on high-frequency resolver feedback lines?

  A: Shielded twisted-pair wiring must be grounded 360 degrees at the drive grounding clamp and kept isolated from power lines.

• Q: What is the power consumption requirement of the board during standard operation?

  A: Typical power dissipation stays under 2 W when driving a standard single resolver load from the onboard excitation source.

• Q: How does firmware flash compatibility affect drive replacement?

  A: Matching the drive controller firmware version guarantees correct parameter mapping and consistent resolver feedback decoding.

• Q: What physical dimensions and shipping weight apply to this part?

  A: The module weighs 0.22 kg with shipping box dimensions measuring 3.6 cm by 31.5 cm by 17.7 cm.